Diagnostic Test

VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
NOTE:
Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
1. Using the scan tool, read active DTCs.
  Is this DTC active?
  
  Yes
  - Go To 2
  No
  - Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. Using the scan tool, read active DTCs from all modules.
  NOTE:
  Check for TIPM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
  
  Does the scan tool display any active DTCs to the conditions listed above?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
  No
  - Go To 3
VERIFY THAT THE HVAC IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. Using the scan tool, select ECU View.
3. Verify that the HVAC is active on the bus.
  Is the HVAC active on the bus?
  
  Yes
  - Go To 4
  No
  - Refer to DIAGNOSIS AND TESTING and perform the No Response from HVAC diagnostic procedure.
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. Using the scan tool, select Network View and select Advanced.
  Is there more than one module with active DTCs "Logged Against" the HVAC?
  
  Yes
  - Replace/update the A/C Heater Control in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace/update the module that set the DTC in accordance with the Service Information
  - Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .